Question

A pilot decreases the landing speed from 70 m/s to 7 m/s in 30 seconds. What was the acceleration of the plane?

Answer 1

Below

Explanation:

As in my other post:

Acceleration = change in velocity / change in time

= (7 - 70) m/s / 30 s = -63/30 m/s^2 = - 2.1 m/s^2